CN112980594A - Developing cleaning agent and preparation method thereof - Google Patents
Developing cleaning agent and preparation method thereof Download PDFInfo
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- CN112980594A CN112980594A CN202110237766.1A CN202110237766A CN112980594A CN 112980594 A CN112980594 A CN 112980594A CN 202110237766 A CN202110237766 A CN 202110237766A CN 112980594 A CN112980594 A CN 112980594A
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2068—Ethers
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2079—Monocarboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
- C11D3/3765—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in liquid compositions
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- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a developing cleaning agent and a preparation method thereof, wherein the developing cleaning agent is prepared from the following raw materials in parts by weight: 75-85 parts of pure water, 10-20 parts of surfactant, 1-3 parts of diethylene glycol monobutyl ether, 0.05-0.15 part of defoaming agent and 1-3 parts of potassium acrylate. Has the advantages that: the developing cleaning agent is a liquid medicine for improving the reverse adhesion of a dry film/a wet film and printing ink, can effectively inhibit a photosensitive polymer dissolved in a developing solution from generating a crosslinking reaction, and avoids monomers from being combined in a cross way to form a polymer, so that unpolymerized photoresist in a tank solution can not generate a secondary polymerization reaction continuously under a specific environment, and the poor quality proportion caused by the reverse adhesion of residual photoresist is reduced.
Description
Technical Field
The invention relates to the technical field of cleaning agents, in particular to a developing cleaning agent and a preparation method thereof.
Background
The PCB is widely applied to electronic products such as information, communication, industry, medical treatment, traffic, military industry, consumer and the like, is used as an important electronic product part, and is a main support body of an electronic component and a carrier for electrical connection of the electronic component.
The method comprises the following steps of carrying out exposure operation in an image transfer mode in the process of manufacturing a PCB, aligning a film with a circuit pattern according to hole positions of the PCB and pasting the film on a PCB copper-clad plate pressed with a dry film, putting the PCB pasted with the film into a manual exposure machine for exposure, and transferring the circuit pattern on the film to the dry film on the surface of the PCB after exposure. Thereby completing the image transfer process.
Various light resistance materials are required to be used in the image transfer process, and the following problems exist when the light resistance is used: unpolymerized photoresist can generate Developer Sludge in the development stage due to light, temperature, and pH, which directly (short circuit) and indirectly (appearance) affect the yield and appearance of the product.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The present invention provides a developing cleaning agent and a preparation method thereof, which are directed to the problems in the related art, so as to overcome the above technical problems in the related art.
Therefore, the invention adopts the following specific technical scheme:
according to one aspect of the invention, a developing cleaning agent is provided, which is composed of the following raw materials in parts by weight:
75-85 parts of pure water, 10-20 parts of surfactant, 1-3 parts of diethylene glycol monobutyl ether, 0.05-0.15 part of defoaming agent and 1-3 parts of potassium acrylate.
According to another aspect of the present invention, there is provided a method of preparing a developing cleaner, the method comprising the steps of:
s1, weighing pure water, a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate in preset parts by weight for later use;
s2, adding the reserved pure water into a reaction kettle reserved in advance and stirring;
s3, sequentially adding a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate into the reaction kettle, and continuously stirring;
s4, when the stirring time reaches a preset threshold value, obtaining a proper amount of mixed solution for detection;
and S5, when the quality is qualified, taking out the prepared mixed solution, and packaging to obtain the required developing cleaning agent.
Further, the preparation of pure water in S2 includes the following steps:
firstly, preliminarily filtering tap water prepared in advance through quartz sand, then filtering the tap water through a reverse osmosis membrane under high pressure, and finally performing ultraviolet sterilization to obtain the required pure water.
Further, in the step S3, sequentially adding a surfactant, diethylene glycol butyl ether, a defoaming agent, and potassium acrylate to the reaction kettle, and continuously stirring the mixture specifically includes the following steps:
firstly, adding the surfactant into the reaction kettle, stirring for a preset time, then continuously adding the diethylene glycol butyl ether into the reaction kettle, stirring for a preset time, then continuously adding the defoaming agent into the reaction kettle, stirring for a preset time, and finally adding the potassium acrylate into the reaction kettle, and stirring for a preset time.
Further, the preset time is 7-15 minutes, and preferably, the stirring time is 10 minutes.
Further, the preset threshold value in S4 is 60 minutes.
Further, in the step S5, a blue-bucket black cover is used for packaging the developing cleaning agent, and the carrying capacity of each packaging bucket is 25 kg.
The raw material components adopted by the invention are explained as follows:
surfactant (b): means a substance capable of significantly lowering the surface tension of the target solution. Has fixed hydrophilic and lipophilic groups and can be directionally arranged on the surface of the solution. The molecular structure of the surfactant has an amphoteric nature: one end is a hydrophilic group, and the other end is a hydrophobic group; the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amino groups and salts thereof, hydroxyl, amide, ether linkages, and the like may also be used as the polar hydrophilic group; and the hydrophobic group is often a non-polar hydrocarbon chain, such as a hydrocarbon chain of 8 or more carbon atoms. The surfactant is divided into ionic surfactant (including cationic surfactant and anionic surfactant), nonionic surfactant, amphoteric surfactant, compound surfactant, other surfactants, etc.
Diethylene glycol butyl ether: is an organic compound that is miscible with water in any proportion, soluble in ethanol, ethers, oils and many other organic solvents. Are often used as solvents for nitrocotton, varnishes, printing inks, oils, resins, etc. and as intermediates for the synthesis of plastics.
Defoaming agent: substances which reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce or eliminate the original foam.
Potassium acrylate: the polymer is an organic cation high molecular polymer, is non-toxic and non-corrosive, is not easy to generate dust, is easy to dissolve in water, is coated and lifted and bonded in a drilling well, is suitable for various slurry systems, and has a better anti-collapse effect.
The beneficial effects are that: the developing cleaning agent is a liquid medicine for improving the reverse adhesion of a dry film/a wet film and printing ink, can effectively inhibit a photosensitive polymer dissolved in a developing solution from generating a crosslinking reaction, and avoids monomers from being combined in a cross way to form a polymer, so that unpolymerized photoresist in a tank solution can not generate a secondary polymerization reaction continuously under a specific environment, and the poor quality proportion caused by the reverse adhesion of residual photoresist is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method of manufacturing a developing cleaner according to an embodiment of the present invention.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.
According to an embodiment of the present invention, a developing cleaner is provided.
According to the developing cleaning agent provided by the embodiment of the invention, the developing cleaning agent is composed of the following raw materials in parts by weight:
75-85 parts of pure water, 10-20 parts of surfactant, 1-3 parts of diethylene glycol monobutyl ether, 0.05-0.15 part of defoaming agent and 1-3 parts of potassium acrylate.
In order to clearly understand the technical scheme of the invention, the technical scheme of the invention is described in detail through specific examples.
Example one
A developing cleaning agent is composed of the following raw materials in parts by weight:
75 parts of pure water, 10 parts of surfactant, 1 part of diethylene glycol monobutyl ether, 0.05 part of defoaming agent and 1 part of potassium acrylate.
Example two
A developing cleaning agent is composed of the following raw materials in parts by weight:
81.90 parts of pure water, 15.00 parts of surfactant, 2.00 parts of diethylene glycol butyl ether, 0.10 part of defoaming agent and 2.00 parts of potassium acrylate.
EXAMPLE III
A developing cleaning agent is composed of the following raw materials in parts by weight:
85 parts of pure water, 20 parts of surfactant, 3 parts of diethylene glycol monobutyl ether, 0.15 part of defoaming agent and 3 parts of potassium acrylate.
For further understanding of the above technical solution of the present invention, the product advantages of the developing cleaner and the corresponding principles will now be described in detail.
The developing cleaning agent of the invention has the following advantages:
1) the main components are inhibitor and foam inhibitor, which can prevent the photoresist in dry film/printing ink from secondary polymerization after development and keep the tank clean;
2) the film scraps can be prevented from being adhered to the board surface, and the product yield is improved;
3) after long-term use, the tank body is kept free from dirt adhesion, and the tank cleaning agent is not needed;
4) the method is simple to operate, does not contain ammonia nitrogen, phosphorus and the like, is ultralow in COD, and is safe and environment-friendly.
The reaction mechanism of the inhibitor in the invention is as follows:
1) dry film dissolution reaction
The carboxyl (-COOH) of the active group reacts with sodium (potassium) carbonate to generate a hydrophilic group COONa (COOK).
2) Inhibitor action
Acts on the hydrophilic groups COONa (COOK) to enhance the water solubility and achieve the effect of inhibiting the anti-adhesion.
The process application characteristics of the developing cleaner of the invention are as follows:
the main application is as follows: copper slag and short circuit caused by developing reverse adhesion and copper leakage on a gold surface (the problem of film adhesion due to pollution of a transmission roller) are reduced;
the process application comprises the following steps: is suitable for various photoresist developing processes (inner and outer layer circuit development and solder mask development lines);
the functions are as follows: combining free radicals generated by a photosensitive initiator in a developing solution to avoid cross combination of monomers to form a polymer;
the purpose is as follows: and the defects of copper slag, unclean etching, gold surface copper leakage and the like caused by reverse adhesion are reduced.
According to an embodiment of the present invention, as shown in fig. 1, there is also provided a method of manufacturing a developing cleaner, the method including the steps of:
s1, weighing pure water, a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate in preset parts by weight for later use;
s2, adding the reserved pure water into a reaction kettle reserved in advance and stirring;
wherein the preparation of the pure water in the S2 comprises the following steps:
firstly, preliminarily filtering tap water prepared in advance through quartz sand, then filtering the tap water through a reverse osmosis membrane under high pressure, and finally performing ultraviolet sterilization to obtain the required pure water.
S3, sequentially adding a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate into the reaction kettle, and continuously stirring;
wherein, in the S3, the surfactant, the diethylene glycol monobutyl ether, the defoaming agent and the potassium acrylate are sequentially added into the reaction kettle, and the stirring is continuously carried out, and the method specifically comprises the following steps:
firstly, adding the surfactant into the reaction kettle, stirring for a preset time, then continuously adding the diethylene glycol butyl ether into the reaction kettle, stirring for a preset time, then continuously adding the defoaming agent into the reaction kettle, stirring for a preset time, and finally adding the potassium acrylate into the reaction kettle, and stirring for a preset time. Specifically, the preset time is 7-15 minutes.
S4, when the stirring time reaches a preset threshold value, obtaining a proper amount of mixed solution for detection; specifically, the preset threshold value is 60 minutes, and sampling detection can be performed when the stirring time reaches more than one hour.
And S5, when the quality is qualified, taking out the prepared mixed solution, and packaging to obtain the required developing cleaning agent.
And in the step S5, when the developing cleaning agent is packaged, a blue barrel black cover is adopted for packaging, and the bearing capacity of each packaging barrel is 25 kg.
In summary, according to the above technical scheme of the present invention, the developing cleaning agent is a liquid medicine for improving the anti-adhesion of the dry film/wet film and the ink, which can effectively inhibit the cross-linking reaction of the photosensitive polymer dissolved in the developing solution, and avoid the cross-linking reaction of the monomers to form the polymer, so that the unpolymerized photoresist in the tank solution does not continue to undergo the secondary polymerization reaction in a specific environment, thereby reducing the poor quality ratio caused by the anti-adhesion of the residual photoresist.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The developing cleaning agent is characterized by comprising the following raw materials in parts by weight:
75-85 parts of pure water, 10-20 parts of surfactant, 1-3 parts of diethylene glycol monobutyl ether, 0.05-0.15 part of defoaming agent and 1-3 parts of potassium acrylate.
2. A method for producing a developing cleaner for realizing the production of the developing cleaner as claimed in claim 1, characterized by comprising the steps of:
s1, weighing pure water, a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate in preset parts by weight for later use;
s2, adding the reserved pure water into a reaction kettle reserved in advance and stirring;
s3, sequentially adding a surfactant, diethylene glycol monobutyl ether, a defoaming agent and potassium acrylate into the reaction kettle, and continuously stirring;
s4, when the stirring time reaches a preset threshold value, obtaining a proper amount of mixed solution for detection;
and S5, when the quality is qualified, taking out the prepared mixed solution, and packaging to obtain the required developing cleaning agent.
3. The method of claim 2, wherein said preparing pure water in S2 comprises the steps of:
firstly, preliminarily filtering tap water prepared in advance through quartz sand, then filtering the tap water through a reverse osmosis membrane under high pressure, and finally performing ultraviolet sterilization to obtain the required pure water.
4. The method of claim 2, wherein the step of adding the surfactant, the butyl diglycol ether, the defoaming agent and the potassium acrylate to the reaction kettle in sequence in the step of S3, and the step of continuously stirring comprises the following specific steps:
firstly, adding the surfactant into the reaction kettle, stirring for a preset time, then continuously adding the diethylene glycol butyl ether into the reaction kettle, stirring for a preset time, then continuously adding the defoaming agent into the reaction kettle, stirring for a preset time, and finally adding the potassium acrylate into the reaction kettle, and stirring for a preset time.
5. The method of claim 4, wherein the predetermined time is 7-15 minutes.
6. The method as claimed in claim 2, wherein the predetermined threshold value in S4 is 60 minutes.
7. The method of claim 2, wherein the developing cleaning agent is packaged in S5 by a blue-can black cover, and the carrying capacity of each packaging barrel is 25 kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110237766.1A CN112980594A (en) | 2021-03-04 | 2021-03-04 | Developing cleaning agent and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110237766.1A CN112980594A (en) | 2021-03-04 | 2021-03-04 | Developing cleaning agent and preparation method thereof |
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| CN112980594A true CN112980594A (en) | 2021-06-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114806261A (en) * | 2022-04-18 | 2022-07-29 | 广东红日星实业有限公司 | Deinking agent and preparation method and application thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294132A (en) * | 2011-06-29 | 2011-12-28 | 南京四新科技应用研究所有限公司 | Defoamer for cleaning printed circuit board |
| CN106094449A (en) * | 2016-06-25 | 2016-11-09 | 深圳市路维光电股份有限公司 | Dry plate abluent and dry plate cleaning method |
| CN106833993A (en) * | 2016-12-27 | 2017-06-13 | 东莞市先飞电子材料有限公司 | A kind of aqueous cleaning agent and preparation method thereof |
| CN108085160A (en) * | 2017-12-04 | 2018-05-29 | 辽宁科技大学 | One kind is used for cleaning agent for printed circuit board and preparation method |
| JP2019065283A (en) * | 2017-09-28 | 2019-04-25 | パナソニックＩｐマネジメント株式会社 | Cleaning liquid and cleaning method of development device |
| CN111019430A (en) * | 2019-12-20 | 2020-04-17 | 四川省蜀爱新材料有限公司 | PCB developing dry film/printing ink tank cleaning agent and use method thereof |
| CN112143567A (en) * | 2019-06-26 | 2020-12-29 | 诺翔新材料(无锡)有限公司 | Photographic fixing system cleaning agent and preparation method thereof |
-
2021
- 2021-03-04 CN CN202110237766.1A patent/CN112980594A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294132A (en) * | 2011-06-29 | 2011-12-28 | 南京四新科技应用研究所有限公司 | Defoamer for cleaning printed circuit board |
| CN106094449A (en) * | 2016-06-25 | 2016-11-09 | 深圳市路维光电股份有限公司 | Dry plate abluent and dry plate cleaning method |
| CN106833993A (en) * | 2016-12-27 | 2017-06-13 | 东莞市先飞电子材料有限公司 | A kind of aqueous cleaning agent and preparation method thereof |
| JP2019065283A (en) * | 2017-09-28 | 2019-04-25 | パナソニックＩｐマネジメント株式会社 | Cleaning liquid and cleaning method of development device |
| CN108085160A (en) * | 2017-12-04 | 2018-05-29 | 辽宁科技大学 | One kind is used for cleaning agent for printed circuit board and preparation method |
| CN112143567A (en) * | 2019-06-26 | 2020-12-29 | 诺翔新材料(无锡)有限公司 | Photographic fixing system cleaning agent and preparation method thereof |
| CN111019430A (en) * | 2019-12-20 | 2020-04-17 | 四川省蜀爱新材料有限公司 | PCB developing dry film/printing ink tank cleaning agent and use method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114806261A (en) * | 2022-04-18 | 2022-07-29 | 广东红日星实业有限公司 | Deinking agent and preparation method and application thereof |
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